Pencil



H. L. FISCHER Nov. 6

v PENCIL Filed Sept. 17, 1920 Fig 1.

Patented Nov. 6, 1923.

HOWARD L. FISCHER, OF ST. PAUL, MINNESOTA, ASSIGNOR TO BROWN & BIGELOW,OF ST. PAUL, MINNESOTA, A CORPORATION OF MINNESOTA.

PENCIL.

Application filed September 17, 1920. Serial No. 410,880.

To all whom it may concern:

Be it known that I, HowARn L. Frsormn, a citizen of the United States ofAmerica, residing at St. Paul, county of Ramsey, and State of Minnesota,have invented certain new and useful Improvements in Pencils, f which.the following is a specification.

My invention relates to pencils and is more particularly adapted to amechanical type wherein the propelling mechanism operates the markinglead into writing position: My pencil is designed to use a fine markinlead, which does not require sharpening, but has a tendency to wear soas to remain sufficiently sharp, by the user gradually rotating thepencil, while it is being used, to allow a comparatively fine line to bewritten with the same.

The primary object of this construction of my pencil is to provide asimple inexpensive operating mechanism, which when associated with atubular barrel provides a magazine space for extra marking lead and doesnot consist of any complicated parts.

The threaded portion of the operating mechanism is fixed in the pencilcasing with its forward end engaging against the conical inner surfaceof the writing end of the pencil while the rear portion is supported andspaced away from the barrel, this means prevents any broken particles ofmarking lead remaining in the pencil when the operating member of thesame is removed for refilling.

In the drawings forming a part of the specification Figure 1 illustratesmy encil.

Figure 2 is an enlarged longitudinal section of the same a portion ofwhich is .broken away.

Figure 3 is a similar view to Figure 2 with the parts in a differentposition and illustrating portions broken away.

Figure 4 illustrates the operating member withdrawn from the mechanism.and barrel.

Figure 5 is a detail portion of the pencil.

Figure 6 is a section on the line 66 Figure 5.

Figure 7 is a perspective of the magazine closure with a portion brokenaway to show the interior construction.

The pencil A is made of suitable mate- 'place and still allowing rial,having a barrel. 10 with a conical forward writing end 11. The barrel orcasing 10 may be of any cross sectional shape and is adapted to housethe lead. propelling or mechanical operating mechanism B.

The mechanism B consists of the tubular threaded member 12, the forwardend 13 of which engages against the inner conical surface 14 while .therear end 15 is centrally supported in the casing 10 by the ring-likemember 16. The member 16 is rigidly connected or secured to member 12 bysolder or other suitable means and is adapted to engage the innersurface of the casing or barrel 10 and to rigidly hold the threadedmember 12 in the pencil barrel. Member 16 is provided with the openings17 through which the marking leads 18 held in the circular magazine 19formed about the mechanism B, extend as illustrated in Figure 2.

A closure or cap 20 frictionally engages in the rear open end of casing10 and is adapted to close the magazine compartment 19 to hold the extramarking leads 18 in thepencil while the operating member 21 is removedfrom the tubular member 12 to insert a new marking lead therein.

The operating member 21 is tubular and is formed with a longitudinallyextending slot 22 through which the teeth 23 of the lead pusher 24extend so as t engage the threads of the tubular member 12 when themember 21 is inserted in the member as illustrated in Figure 2.

An engaging head 25 is attached to the rear end of the operating member21 and extends from the end of the pencil A when the operating mechanismis positioned in the same ready for use. By rotating the head 25 themechanism B is operated to move the marking lead into or out of writingposition.

A spring lock is formed in the rear end of the tube 12 by cutting ashort longitudinal slit 26 in the tube and forming an annular groove 27near the rear edge which is adapted to engage in the annular groove 28formed in the shank of the head 25 to lock the operating member 21 inposition in the pencil A with the head 25 adjacent the cap 20. Thismeans'forms a spring catch which is suflicient to hold the operatingmember in it to be rotated to e lead pusher 24 is operate the pusher. T

vided between member 12 and the member 21 to irictionally hold themember 21 in the When it is desired to insert a new mark-' ing lead inthe socket 29 of the pusher 24,

1c the head 25 is engaged to draw the operating member 21 out of thepencil and when the member 21 is withdrawn as illustrated in Figure 4:the old stub of the marking lead is removed from the socket 29' and anew 15 marking lead is removed from the magazine compartment 19 byremoving the cap 20, then inserting the new lead in the socket 29. Afterrefilling the socket 29 the operating member 21 with the new markinglead is in- 2 serted in the threaded member 12 until the spring catchformed on the rear of the tubular member 12 engages in the recess 28.

The pencil A involves only a small number of parts, nonepf which are ofa compli- 2 cated construction yet being adapted to per;

form the functions required of a practical mechanical pencil and thesefeatures are of primary importance in my'invention.

In accordance with the patent statutes 1 30' have described theprinciples of operation of my encil and while I have illustrated aarticu ar construction I do not wish to cone myself to the exact detailsillustrated but desire to protect the invention within thescope of thefollowing claims:

I claim:

1. A encil comprising a casing, having a forwar conical end, a tubularthreaded member adapted to engage the inner surface of the conical end,means adapted to rigidly hold said threaded member in said barrel andspace it from said barrel in a manner to form a space for extra markingleads thereabout, a closure cap for said magazine space to the rear ofsaid barrel and a removable rotatable operating member comprising aslotted tube and a lead pusher to move a marking lead into writingposition when said operating member is rotated.

A pencil comprising a tubular barrel, a

threaded member fixed against movement in sald barrel in a manner toprovide a space between said threaded member and barrel for extramarking leads, a closure cap for closing the rear end of said extramarking lead space, a lead pusher, a removable rotatable operatingmember adapted to longitudinallycarry said pusher.

3. A pencil including a tubular barrel, a threaded member -fixed againstrotation in said barrel to provide a space for extramarking leadsthereabout, a cap adapted to frictionally engage the rear end or saidbar- 'rel to close the rear end of the space about said threaded member,a rotatable operating member positioned concentric in said threadedmember, a threaded lead pusher carried by said operating membercooperating with said threaded member, and means for looking saidoperating member against longitudinal movement but free to rotate withits engaging end projecting from the rear end of said barrel, saidoperating means and said cap being removable separately from said barrelfor the purpose specified.

4. A mechanical pencil comprising means for propelling a marking lead ineither direction positioned within the pencil to provide amagazine spaceabout the propelling means, said propelling means including a removableoperating member, a threaded member, a pusher adapted to provide sprintension between said operating member an said threaded member andlocking means adapted to engage said operating member to hold it againstfree longitudinal movement but to allow the same to be removed whendesired. 1

a 5. A mechanical pencil, comprising a barrel, a threaded member rigidlypositiond and removably fixed within said barrel, an operating memberadapted to rotate axially in said threaded member, a threaded leadcarrier adapted to engage said threaded member carried by said operatingmember, a slit formed in the rear end of said threaded member, anannular groove formed intersecting said slit and an annular grooveformed in said operating member adapted to be engaged by the grooveformed in said threaded member 'to lock said operating member againstfree longitudinal movement, but allowing it to rotate to operate saidlead carrier of said pencil.

HOWARD L. rrsonnn.

